Minkowski spacetime and GRT.

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1.
SRT.

Minkowski spacetime was born in SRT.
In SRT gravity is absent.
It means that Minkowski spacetime does not have gravity
and this spacetime is Pseudo-Euclid's flat spacetime.
Minkowski spacetime is absolute conception.

2.
GRT.

When Einstein put mass into Minkowski spacetime
it is curved.
When Friedman put time into Minkowski spacetime
it is curved too.
In GRT the Minkowski spacetime curves.
If Minkowski spacetime is curved it isn’t more Minkowski spacetime.
The curvature is gravity space.
This “Minkowski spacetime” is now Gravity space.
Gravity space has 3-D + time.
Gravity space (3-D + time) is relative conception because
gravity depends of mass and speed.
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Best wishes.
Israel Sadovnik. / Socratus.